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نویسندگان مقالات پربازدید :
مجله مهندسی شیمی
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • photodegradation performance of 1,1,1-trichloroethane in aqueous solution: in the presence and absence of persulfate

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    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 797
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     photodegradation of 1,1,1-trichloroethane (tca), a chlorinated solvent, with vuv and vuv/s2o2-8 processes was investigated. the effects of various parameters including solution ph, cl− and hco-3 anions, and humic acid (ha) were evaluated. the results indicated that tca can be effectively removed under vuv irradiation, and the addition of s2o2-8, significantly enhanced tca removal. tca decomposition in both processes follows the pseudo-first-order kinetic model. in the ph adjusted solutions (from ph 3 to 11), maximum tca degradation rate occurred at ph 3 and remarkable inhibition at ph 11 in the two processes. both cl− and hco-3 anions, as well as ha, adversely affected tca degradation performance. moreover, tca degradation in the vuv/s2o2-8 process was more sensitive to all the influence factors than in the vuv process. the organic chlorine in tca was released completely to chloride ion as a final product in both processes. several reaction intermediates, including 1,1-dichloroethylene, 1,1,1,2-tetrachloroethane, perchloroethylene, carbon tetrachloride, chloroform, and dichloromethane were identified during tca degradation in the presence of s2o2-8. in summary, it can be concluded that the presence of persulfate was much more effective than the vuv alone, but the latter was more environmentally friendly due to the formation of nontoxic intermediates.

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